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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea1ae259de74cb43e8bb98a7bff2e85a50e82fff18fa46b3289a52c51bf4099a' 
  AND token = 'W6sEI9cN5OfLxyEfCJGTiLkfG7IQAw8KwpHPOmLhDJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}